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Note 6 - Leases (Tables)
9 Months Ended
Dec. 31, 2019
Notes Tables  
Lease, Cost [Table Text Block]
   
December
31,
2019
 
Weighted average remaining lease term for operating leases (in years)    
8.3
 
Weighted average discount rate for operating leases    
5.0
%
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
2020
  $
101,875
 
2021
   
101,875
 
2022
   
101,875
 
2023
   
104,375
 
2024
   
106,875
 
Thereafter
   
374,063
 
Total lease payments
   
890,937
 
Less: Imputed interest
   
(205,696
)
Present value of operating lease liabilities (a)
  $
685,242